There are several minor problems in DnD:
- DnD/Clipboard partially fails in present of CF_TEXT format or format-with-too-long-names.
- DnD/Clipboard partially fails in present of corrupted HTML header (often use-case)
- DnD/Clipboard does not support memory-mapper file transfer for attachments under the Windows OS
- DnD/Clipboard API does not enumerates mime types that were not registered in FX before
- Typo in Webnode DnD support subroutine

There is no visual tool to test and control application in DnD functionality.
JavaFX need a toot that could investigate DnD context from Java and native applications to extent integration and test exported data.